From 9c52ab4a6688782d0db723bd411db745fed08087 Mon Sep 17 00:00:00 2001
From: Jonas Suhr Christensen <jsc@umbraculum.org>
Date: Sat, 11 Apr 2015 19:11:31 +0200
Subject: ADded local cache.

---
 src/cachemanager.cc | 54 ++++++++++++++++++++++++-----------------------------
 1 file changed, 24 insertions(+), 30 deletions(-)

diff --git a/src/cachemanager.cc b/src/cachemanager.cc
index d047d66..9288ed1 100644
--- a/src/cachemanager.cc
+++ b/src/cachemanager.cc
@@ -81,6 +81,7 @@ void CacheManager::deinit()
 }
 
 // Invariant: initial_samples_needed < preloaded audio data 
+// Proposal: preloaded > 2 x CHUNKSIZE? So that we can fill c.front immediatly on open
 sample_t *CacheManager::open(AudioFile *file, size_t initial_samples_needed, int channel, cacheid_t &id) 
 {
   {
@@ -97,13 +98,12 @@ sample_t *CacheManager::open(AudioFile *file, size_t initial_samples_needed, int
     return nodata;
   }
 
-
   cache_t c;
   c.file = file;
   c.channel = channel;
   c.pos = initial_samples_needed;
-  c.front = file->data;
-  c.back = nodata;
+  c.front = file->data + initial_samples_needed;
+  c.back = file->data;
   // Allocate buffers
   // Increase audio ref count
 
@@ -116,11 +116,11 @@ sample_t *CacheManager::open(AudioFile *file, size_t initial_samples_needed, int
   localcache[id] = c.front;
 
   if(initial_samples_needed < file->size) {
-    event_t e = createLoadNextEvent(id, c.pos, LOADNEXT);
+    event_t e = createLoadNextEvent(id, c.pos, &c.back);
     pushEvent(e);
   }
 
-  return c.front;
+  return file->data; // preloaded data
 }
 
 void CacheManager::close(cacheid_t id)
@@ -141,11 +141,16 @@ void CacheManager::close(cacheid_t id)
   // Decrement audiofile ref count
 }
 
-const CacheManager::cache_t CacheManager::getNextCache(cacheid_t id)
+CacheManager::cache_t CacheManager::getNextCache(cacheid_t id)
 {
   MutexAutolock l(m_caches);
   cache_t c = id2cache[id];
+
+  sample_t *tmp = id2cache[id].front;
+  id2cache[id].front = c.back;
+  id2cache[id].back = tmp;
   id2cache[id].pos += CHUNKSIZE;
+  
   return c;
 }
 
@@ -157,22 +162,18 @@ sample_t *CacheManager::next(cacheid_t id, size_t &size)
     return nodata;
   }
 
-  size_t localpos = localcachepos[id];
-  sample_t* localbuf = localcache[id];
-  if(localpos < CHUNKSIZE) {
-    localcachepos[id] += FRAMESIZE;
-    return localbuf + FRAMESIZE;
+  if(localcachepos[id] < CHUNKSIZE) {
+    localcachepos[id] += size;
+    return localcache[id] + localcachepos[id];
   }
 
-  localcachepos[id] = 0;
-  localcache[id] = NULL;
-
-  const cache_t c = getNextCache(id);
+  cache_t c = getNextCache(id);
   
+  localcachepos[id] = 0;
   localcache[id] = c.front;
 
   if(c.pos < c.file->size) {
-    event_t e = createLoadNextEvent(id, c.pos + CHUNKSIZE, LOADNEXT); 
+    event_t e = createLoadNextEvent(id, c.pos + CHUNKSIZE, &c.back); 
     pushEvent(e);
   } 
 
@@ -181,18 +182,10 @@ sample_t *CacheManager::next(cacheid_t id, size_t &size)
 //  return s;
 }
 
-void CacheManager::loadNext(cacheid_t id) 
+void CacheManager::loadNext(event_t &e) 
 {
-  m_caches.lock();
-  cache_t c = id2cache[id];
-  sample_t *tmp = c.front;
-  c.front = c.back;
-  c.back = tmp;
-  id2cache[id] = c;
-  m_caches.unlock();
-
-  // do work
-  tmp = tmp + CHUNKSIZE;
+  cache_t c = id2cache[e.id];
+  *e.fillbuffer = c.file->data + e.pos;
 }
 
 void CacheManager::thread_main()
@@ -211,7 +204,7 @@ void CacheManager::thread_main()
 
       switch(e.cmd) {  
         case LOADNEXT:
-          loadNext(e.id);
+          loadNext(e);
           break;
 //        case CLEAN:
 //          break;
@@ -233,12 +226,13 @@ void CacheManager::pushEvent(event_t e)
   sem.post();
 }
 
-CacheManager::event_t CacheManager::createLoadNextEvent(cacheid_t id, size_t pos, cmd_t cmd)
+CacheManager::event_t CacheManager::createLoadNextEvent(cacheid_t id, size_t pos, sample_t** fillbuffer)
 {
   event_t e;
   e.active = true;
   e.id = id;
-  e.cmd = cmd;
+  e.cmd = LOADNEXT;
   e.pos = pos;
+  e.fillbuffer = fillbuffer;
   return e; 
 }
-- 
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